Various concentrations of copper were embedded into silica matrix to xerogel forms using copper source Cu(NO3)2∙3H2O. The xerogel samples were prepared by hydrolysis and condensation of Tetraethyl Ortho-Silicate (TEOS) with determination of new molar ratio of the components by the sol-gel method. After ambient drying, the xerogel samples were heated from 60 to 1000˚C at a slow heating rate (50°...

beta-thalassemia, by its high frequency and heterogenecity, constitues a real problem of health in iran. aboute 13 beta globin mutations encompass 70-90% of mutations spectrum in iran, the rest are rare or unknown. in this study six mutations of the codon ivsi-130(g-c), fr16 (-c), codon35 (-c), fr23/24(-g), codon8 (+g) and codon 20 (gtg-gag) were recognized and added to spectrom of beta globin ...

background: holothuroids (sea cucumbers) are members of the phylum echinodermata, which produce saponins. saponins exhibit a wide spectrum of pharmacological and biological activities. in this study, we isolated the crude saponins from the body wall of the dominant iranian species of sea cucumber, holothuria leucospilota (h. leucospilota). the purpose of this study was to confirm the presence o...

molybdenum thin films with 50 and 150 nm thicknesses were deposited on silicon substrates, using dc magnetron sputtering system, then post-annealed at different temperatures (200, 325, 450, 575 and 700°c) with flow oxygen at 200 sccm (standard cubic centimeter per minute). the crystallographic structure of the films was obtained by means of x-ray diffraction (xrd) analysis. an atomic force micr...

In this paper we show that if A is a unital Banach algebra and B is a purely innite C*-algebra such that has a non-zero commutative maximal ideal and $phi:A rightarrow B$ is a unital surjective spectrum preserving linear map. Then $phi$ is a Jordan homomorphism.

we define a new type of spectrum, called δ-approximate spectrum, of an element a in a complex unital banach algebra a and show that the δ-approximate spectrum σ_δ (a) of a is compact. the relation between the δ-approximate spectrum and the usual spectrum is investigated. also an analogue of the classical gleason-kahane-zelazko theorem is established: for each ε>0, there is δ>0 such that if ϕ is...